East of Philly is Dr. Kennith Dazen at the Animal & Bird Health Care Center in Cherry Hill, NJ. Probably further away than you would like to drive I would imagine. I used to visit his clinic when I lived in Pennsville, NJ. He is knowledgeable though expensive. Pretty passionate about bird care.
If you (or anyone else) goes to see him, say hello to Courtney (his B&G Macaw) for me.
He's not an "avian" vet but he handles all exotics, Dr. Gulliford at Somerton Animal Hospital in Northeast Philly, he's very reasonably priced and very nice, as is everyone at the office.
I took Inca, my conure, to this vet! Great service, they called me and asked how Inca was doing days after his check-in. They were so gentle with him and fixed up his infection right away.